<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Does Boost.Log support logging at process initialization and termination?</title>
<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="../../index.html" title="Chapter 1. Boost.Log v2">
<link rel="up" href="../rationale.html" title="Rationale and FAQ">
<link rel="prev" href="fork_support.html" title="Does Boost.Log support process forking?">
<link rel="next" href="why_crash_on_term.html" title="Why my application crashes on process termination when file sinks are used?">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td></tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="fork_support.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../rationale.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="why_crash_on_term.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="log.rationale.init_term_support"></a><a class="link" href="init_term_support.html" title="Does Boost.Log support logging at process initialization and termination?">Does Boost.Log support
      logging at process initialization and termination?</a>
</h3></div></div></div>
<p>
        It should be fine to use logging during the application initialization (i.e.
        before <code class="computeroutput"><span class="identifier">main</span><span class="special">()</span></code>
        starts). But there are a number of known problems with Boost.Log that prevent
        it from being used at process termination (i.e. after the <code class="computeroutput"><span class="identifier">main</span><span class="special">()</span></code> function returns), so the official answer
        to the second part is no. It may work though, in some very restricted setups,
        if several rules are followed:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Do not create any objects at process termination, including loggers,
            attributes or sinks. Try to create and cache the required objects as
            soon as the application starts (maybe even before <code class="computeroutput"><span class="identifier">main</span><span class="special">()</span></code> starts).
          </li>
<li class="listitem">
            Do not use global loggers at process termination.
          </li>
<li class="listitem">
            Do not call <code class="computeroutput"><span class="identifier">logging</span><span class="special">::</span><span class="identifier">core</span><span class="special">::</span><span class="identifier">get</span><span class="special">()</span></code>
            at process termination. Get that pointer as early as possible and keep
            it until the process terminates.
          </li>
<li class="listitem">
            Do not use named scopes in termination code.
          </li>
</ul></div>
<p>
        These rules don't guarantee that the library will work in termination context
        but they may help to avoid problems. The library will get improved to support
        this use case better.
      </p>
</div>
<div class="copyright-footer">Copyright © 2007-2024 Andrey Semashev<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
      </p>
</div>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="fork_support.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../rationale.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="why_crash_on_term.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
</div>
</body>
</html>
